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    <title>Document</title>
    <style>
        p {
            height: 30px;
            line-height: 30px;
            font-size: 12;
            border: 1px solid #ccc;
        }
        p a[href*=eee] {
            background: springgreen;
        }
    </style>
</head>

<body>
    <p>
        <a href="https://wwww.baidu.com/xxx/yyy.html:;">
            按钮
        </a>
    </p>
    <p>
        <a href="https://wwww.baidu.com/bbb/yyy.html:;">
            按钮
        </a>
    </p>
    <p>
        <a href="https://wwww.baidu.com/eee/yyy.html:;">
            按钮
        </a>
    </p>
    <p>
        <a href="https://wwww.baidu.com/fff/yyy.html:;">
            按钮
        </a>
    </p>
    <p>
        <a href="https://wwww.baidu.com/ggg/yyy.html:;">
            按钮
        </a>
    </p>
</body>

</html>